The Limiting Oxygen Index (LOI) test is a widely used research and quality control tool for determining the relative flammability of polymeric materials. A numerical index, the ‘LOI’, is defined as the minimum concentration of oxygen in an oxygen – nitrogen mixture, required to just support downward burning of a vertically mounted test specimen. Hence, higher LOI values represent better flame retardancy. The test method is generally reproducible to an accuracy of + 0.5% and although originally designed for testing of plastics, the method has been used extensively for evaluating the relative flammability of rubbers, textiles, paper, coatings and other materials.

LOI tests can be conducted in accordance with national and international standards including BS 2782 (Part 1, Method 141), ASTM D2863 and ISO 4589-2.

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